Django regex - optional grouped parameters

Question

I'm constructing the urlconf for a website but I'm facing a couple of issues;

At some point I have to present a list of tasks which can eventually be reordered. The problem is that I have no clue on how to go about configuring the regex.

So far I've got this:

url(r'^myapp/mytasks, myview.tasks),

The default behavior is to accept requests at www.mydomain.com/myapp/mytasks.

However should the order button be pressed by a user, I need Django to also accept requests of type:

www.mydomain.com/myapp/mytasks/sort_by/price_highest www.mydomain.com/myapp/mytasks/sort_by/price_lowest

but not

www.mydomain.com/myapp/mytasks/price_lowest

Is there a regex for this scenario?

Thank you all in advance.

P.S Ideally I would also like to know how I could possibly reverse them.

@AvinashRaj This won't work for the default scenario: www.mydomain.com/myapp/mytasks. — stratis
– stratis, Commented Mar 6, 2015 at 13:57
For options such as sorting, I'm more inclined to use a query string such as www.mydomain.com/myapp/mytasks?sort_by=price_highest, or even www.mydomain.com/myapp/mytasks&sort_by=price&reversed=false. You'd then have to process the query string inside the view. — user707650
– user707650, Commented Mar 6, 2015 at 13:58
@Konos5 try url(r'^myapp/mytasks(?!/price_lowest)', myview.tasks) — Avinash Raj
– Avinash Raj, Commented Mar 6, 2015 at 14:01
@AvinashRaj Thanks but I think you are missing the point here. It's not that I need everything except price_lowest. I need price_lowest or price_highest or whatever other parameter comes to my mind but only after /sort_by/ exists. If sort_by is absent, discard all and revert to default. — stratis
– stratis, Commented Mar 6, 2015 at 14:06

catavaran · Accepted Answer · 2015-03-06 14:44:08Z

1

Create two url records for the same view:

url(r'^myapp/mytasks/$', myview.tasks, name='tasks'),
url(r'^myapp/mytasks/sort_by/(price_highest|price_lowest)/$', myview.tasks,
                                                   name='sorted_tasks'),

And then change the signature of the tasks() view to:

def tasks(request, sort_by=None):
    ...

In the template you can easily point to the both versions:

{% url 'tasks' %}
{% url 'sorted_tasks' 'price_highest' %}

UPDATE: If you really want to make the only one url record then the regex will be:

'^myapp/mytasks/(?:sort_by/(price_highest|price_lowest)/)?$'

But I am not sure that it will work with {% url %} tag.

edited Mar 6, 2015 at 14:44

answered Mar 6, 2015 at 14:00

catavaran

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4 Comments

stratis Over a year ago

Thanks. I am aware of the multiple url records. However I need to do this in a single url record using only regex so I can easily reverse it in my templates.

catavaran Over a year ago

What is the problem with reversing of two urls? See the updated answer.

stratis Over a year ago

As you put it... there is no problem and your solution seems to be working perfectly fine. However it is a matter of personal preference. And I would really like to see this tricky regex that would accomodate my problem.

catavaran Over a year ago

The regex is not so tricky but I never used something like this in url and not sure that the reverse for this regex will work. You can test it if you want. See the updated answer.

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